How to jailbreak your ps3 on 4.89 with new CFW(4.89 Downgrade) - YouTube
How to Downgrade CFW on a Jailbroken PS3 - YouTube
Ps3 Downgrade Uk - NOW LIVE – PS3 UPDATE 4.80! Update 2: 2-step verification is coming, Sony has confirmed. Additionally, a Twitch app is now available to download from thePlayStation Store worldwide.
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How To Downgrade PS3 4 81 To 3 55 and Install 4 80 CFW Step by Step - YouTube